Special actions like category lists are not supported. (The only supported action is the regular table.)

Block elements for code and syntax highlighting are not yet supported.

Wikka Markup normally assumes that links like this go to the page "links" and have the text "like this". This has been changed so that these links go to "links like this" and have the same text. However, there's an exception: http://google.com Google will still produce a link to Google properly. If it's a full URL, you'll get a full link. (This confusion exists because Wikka does not implement MediaWiki syntax correctly.)